Well, you could adjust the taps on the power transformer for a lower voltage. The problem with that is that when the brown-out is over, the voltage will be too high stressing the power supply and tubes. Personally, I just wouldn't use the amp during brown-out conditions.

You don't have to use the internal power supply in the amp to key the relay.

I'd be tempted to re-wire it to use a separate 12Vdc wall-wart (regulated, so its output would be 12Vdc regardless of line voltage, unless it dipped below 90Vac) and then just key that. $10 mod that should take about ten minutes.

Regarding the plate voltage - I'd not change it unless I knew my measurement was accurate (Did you have a good probe or are you using the on board meter?) The difference isn't really worth a lot of worry.Regards,Dick KH2G

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